Change speed gearing



Oct. 19, 1937.

P. L. TENNEY CHANGE SPEED GEARING Filed 001:. 17, 1934 2 Sheets-Sheet"? 7 V I g 1 "JV shows in vertical invention.

' Patented Oct. '19, 19 37 7 UNITED This invention v relates to change speed transmission and is intendejdprimarily ior nse on motor vehicles.

. An. object of the inventionis to provide a two speed driving arrangement in advance of a' pluj ralxspeed transmission so constructed that the, same lower speed ratios are available regardless of which one of the tworelatively high driving ratios is inoperative position.

' The invention will'be understood byreference;

to the accompanyingldrawingsinwhich Fig. 1

Fig. 2 shows also Referring by transmission housing' entering which is an input shaft' 5. This shaft maybe the shaftdriven' by the engine through the 'clutch as is usual.

'- It is rotatably supported by" suitable bearings I. Within'the housing'shaft-fi is 'provided with a gear 9', a splined portion-ll; and a reduced end l3. An alignedshaft I5Lsurrounds the re-' duced end l3, carries a clutch I 'l,"is=-supported.j in the housing at IQ, carries a gear '2l-adjacenti the bearing, a clutch 23 adjacent the 'gear and' 1 held from rotation by suitable'means 24,'- and has an elongated reduced 'end 25. The output shaft 21 is tubula'rgsurround'sthe reduced end 25 of shaft I5, is supported thereby and by a I bearing 29; and is provided a speedometer drive pinion 3L Slidableon splines H of shaft'5 is a 'jaw clutch -'33 adaptedto engage teeth of clutch l'l. "As-- sociated with clutch I! is arr-axially movable.

' synchronizing clutch member 31- mounted noni rotatably relative to clutch 33. Reciprocation of clutch 33 first moves clutch "member 3.1- with itself to engage frictionallythe surface of clutch "11 thus to effect synchronization. Thereafter part 33' moves relativelyto 3'Iandjits jaw teeth 'engage' teeth 35 to'positivelydrive'shaft l5 from f shaft 5. This clutch arrangement 'is a substan-f" 'tiall'y conventional mechanism for synchronizing;

the'shaft prior to jaw clutch engagement. f

, "A' slidable sleeve 39 is 'mountednon-rotatably 'on' the output shaft 21. It has at'its ends jaw I teeth 4| and 43 adapted 'toengage teeth 45 of clutch23 and teeth Q'Ion g'earJS respectively;

Gear "is mounted loosely on 'output 'shaft'l'l. Associated with sleeve 39 are synchronizing cone clutch'faces on clutch 23 and gear!!! to effect a and '53 cooperating'with conical synchronism prior to engagement of the 'jaw' teeth in the customary manner.

on the drawings by the hand lever 55 and the No novelty is involved in this applicav I I I "onanenfsrncn GEaRmGf: p I 7 Perry LITenny, Lansing, Mich., 'asslgnor to f General Motors Corporation, Detroit, Mich, a corporation otDelaware v .1

Application October 17.1934, swarm. 74 ,569

2 Claims. (01. 74-338) section one embodiment of the insection a secondembodip t v I i t a Y f synchronizing clutch designatedby nurnerahlfl." reference characters to' the draw- Shaftti is'provided with'a flxed-"geartl adaptedings and first to Fig; 1, numeral 3 represents a kSuitable' shifting means for reciprocating the sleeve is represented lever v 5.5fefieccstl'1e reciprocating? movement of sleeve 39 and'further descriptionis belivedto on a gear ll'in constant meshwith thefabpv to be engaged by gear 59 when; the latter is 're- 10 described gear 21. Afslidingfclutch l3"is non- 'rotatably'mounted on shaft 5| andisioperable to clutchfgear'll tothe shaftby'means1ofteeth'-,

15 .and 'l|, there being preferz blyemployed-ga a5 'shaftiand in constant mesh withg'ear 4e onlth'e' {ingengaged with gear 81-, andigear adapted. to drive gear 59 when the latteris'reciprocatem;

into engagement "therewith. p

The shiftingof clutches 33'and l3may be 'niade 25 in any waydesired.with'theunderstanding that 1 the shifting means jis'independent of the means.

for shifting-sleeve 39' and gear 531' Thesetwo clutches, 33 and' 13,"it*should"alsofb noted;- ar I to lie-shifted simultaneouslytemove inopp'osite" directions to the'end that 'whenoneclutch is engagedthe other is released. No specific means a is illustrated for sor'noving'fthe twoiclutche's sinmltanebusly, there being many eiramples for so moving two clutches on two shafts in"the prior* airti By this means shafti li may; be drivendi-f rec'tly'from' shaft 5, or it may bedrlven from-shaft j .5 through reductiongearing 5 -63 and'"|l.-2 i .j. Shaft I5 may be considered as comparable to the f 1 input shaft of a modified form 01 the honveritional,

three-speed transmission. 'The modiflcationfcon j sists; first, in anarrangementwhereby the countershaft is'driven by gearing 9 69 and not from the output shaft 2'].v sleeve 3911s reciprocated to clutch shaft 21 to shaft I5. I For one-of thelower 3-59t0 shaft Blfand from shaft through.

' gears and 49 to shaft 21. Inthis driving-ar rangement it shouldbe noted that shaft l5 may; be. rotated butnot under load from eitherlclutch 33 or 13. Similarly, regardless of which-of the clutches 33 and I3 is in action: to drive'shaft l5, low speed is obtained from shaft 6| through gears 1 *sh'aft l'5 'and,' second, in that shaft 15 may itself 'be driven with two top' or relatively high speeds; one whenclutch 33 is operative and a'lower -topl speed when" clutch-13 is in operationi Tofdeliver theone or the other'of-thesetop speeds to p u n Fla 11111616 18 shone iimihiimmmvm u i-wi r e" e wefi fl ej clutch tn ginp t shaft snain srineeiat'e shaft; ssidlsst-i A verse'is not effected by the rate ofrrotation im parted; to "intermediate shaft ll It niatt'ersnot iwhether-itis': driven directly from .l or in- 7 directly through gearing'll and II.

a ,choieeqtltwo, high speed: a liner 1 nun'iber oii lower driving: ratioaIi In this J;

speedplutches.

y The above described transmission provides A 1 determinedratios for low speed fected by the setting of the clutches "inithe top, speeds.

ratios may be used with the high speed clutches in either-position,, to thee'nd ot' providinig as it i e were, twodiflerent three-speed transmissions injtheir' lower speed ratiosbut-havinidiflerent v top speed ratios,fthereby 'renderinzthe-transmis- ;;sion'fusefulfi'or diilfe're'nt' load 'a'nd road It the direct drivethroudh clutch- 31 be described nn .;'nverar1v ,1it w n- Beiseeathst mheavy, a] iosdsjnnror'steen grades thejcllrtchjflfisivsiij bi j't supra 'a Joursfpeed transmission with: .g'radualisteps in ratio up to overdrive." Ii, on'the -othe'rj hand while overdrive clutch is .1 it"ls furthjer necess arygto stopl and start, the" o'perator may drive through thelower ratios and 2 directly 'to ,the v overdrive without the peedii the-load androadpermit; when drivlns" witha light load or on a' leveljroad itvwill ob- 1, vious thattne accelerationvin secondespeed may easllyfigarried toj fl point Whei'e-,.th" ht y broaderstep to over-gear instead'oi. speed [y @be made, thus. avoiding shittingol the there are providedfthreelower, operable 1 w h 1 5 d pens ent, 9 the 7 9f hi speed dn i ssm mw i ishspeedf iratiosgmay be an sequence or either one of h o s eedg b t iorri i a four-speed change :Beferring. to Fig.2; n eral: m is missus shaitfderivin giits rotatio rrom th engine and,

fit s clutchlwas usual, It is supported} in casin:

ing, jaw iolutch l is having :teeth to ensure L cogoperatingteeth on gear;lll9.fiJBeyond thecasinebearinzglji forshaftgirll-there is a seat m :j oifshattllil rotatably supports an, output 12L; slidablyandsnonerotatably on shatt lzl is:a. .clutchgear elementaill Y .to-be reciprocated by. a fork III; 'slidable -a;ndfnon'-rotatably mounted on-shalt lll..is a unitycomprising, two "gears lib-III. An end ibearingi lll icompletes the support otshatt Jfl provided with clutch teeth; a, 'I'heholloiv end in the casings-vibe countershai't-Jll' is mouted v i i e' mine y K16811 8 "3,1 1, "1 1 t meshwith sear" liltj-Blidably splinedtbQshaft will :is aclutch 3 having jaw teeth lllztoengage the. teeth of the hub 01 a gear-Ll" loosely jmountedonithe countershatt; I" is in constant mesh with gear. lll described above.

shaft has secured thereto a gear illyin constant 1 The ,countershait; has "a; gearllfadapted to be engaged by slidable gear 1-2}. It also has By theuse otclutch li theihirdr :speedthrough gears IL-2| maybe used asitheis top'speed ora fourth speed may be used when clutch I} is in operative position, speed reverse'idiers The 'ey silord are am 7 the m ma w s immest t flo b which illtis MYmgby shaftflllti nts med ei m s iiib mv t put shafts, respectively. whereby-theoutput shaft 5 tdrivene stnisnu ya iinlle' betwe hef v zs e t helt .2; y goutput shatt toeethervwith' gearingbetween; thev 1 v wmmi'tjand intermediate shait g mesnsitc and respectively. idler element III is vslidable'by means'ot a 1 mm, ltis'provlded ff w t nsears issand m ,to' o gear-"l" and' gear ill for reverse a driving.

1n thisrembodirnent crib in enuon lll and I" are to be simultaneouslyfmovedgin ""thisflj'case in the same direction, torender or 'thepotheact-the' clutches operatives; By so movinghthe clutches intermediateshaft 'i ll msy i bedrivenattwo unlike speeds i speed reverse ratios are obtained by recipgf;

roosting the several'coun s am-anew whether itbedriy en by inieansfoiicmtcb m or flthrous W pe an clutch I"; LnThef operation and ut t in en io Y t' vlmfl n Wis r W nbeln'ection withthe iorin" mus- '1 wmb and outmit shaitsrjlock'ins cmtch means between parallel countershaitrconstantly' less-ins render said 1ast-named, earing active m sn i n dto drive i t o s isnadi nutrin emediste J v utw She wi cou er w i s s! 1' t n 'vth l-llim mam s-Mh r a e, b w en id iinf Mild intermediate to; efl'ect.= 81% V H o "an speeddriveoft inter-meal" llllbyabearing ill]; Itisprovidqedwith anxed' 'gear I09.- Within the open endot-shaft/illis o a y simiwr t th i n m i shaft. J l I it This shaft hassplines 'l I ,i i'or fa slid-'1 s a t. p na y perable s s nsv h tweent e i e m d t ha t-sh h t on y hish ee bu m h Q1 momma mama it fib e' c chbe w anh h erml u vu h tt D ww-bm ez eduction. sesrlns between t the 'countershatt 1 output .uhiti'iia to .provideapluralityoi ratiodrivesftherfebstween whereby the output-shaft,m syubedriven; relafiiWlY low speedsthtwhthesaid constant sh mm: smit s n lezt 1 -.,fl9 3- w s b e n the so-" im .out'w h en: e sh mh e; 1 the int rm te th th ml li ss iendz es d wst ihi'ch "in sai -2 speeds t e. nter e te sih ins, in thaf the a adapted t he med the r eas "attain op mpa lm o er e 8 18. betwee i thecountershaift; and; output upon operablej'to drive theroutput. st the speed to! the int rmediamshsit st n: 

